Motorcycle speedway, usually referred to as speedway, is a motorcycle sport involving four and sometimes up to six riders competing over four anti-clockwise laps of an oval circuit.
The motorcycles are specialist machines which use only one gear and have no brakes; racing takes place on a flat oval track usually consisting of dirt, loosely packed shale, or dolomite (mostly used in Australia and New Zealand). Competitors use this surface to slide their machines sideways, powersliding or broadsiding into the bends. On the straight sections of the track the motorcycles reach speeds of up to 70 miles per hour (110 km/h).

The exact origins of the sport are unknown but there is evidence of a type of speedway racing being practised in the USA before the First World War and in Australia in the late 1910s and early 1920s. There are now both domestic and international competitions in a number of countries including the Speedway World Cup whilst the highest overall scoring individual in the Speedway Grand Prix events is pronounced the world champion. Speedway is popular in Central and Northern Europe and to a lesser extent in Australia and North America. A variant of track racing, speedway is administered internationally by the Fédération Internationale de Motocyclisme (FIM). Domestic speedway events are regulated by FIM affiliated national motor sport federations.

The early history of speedway race meetings is a subject of much debate and controversy. There is evidence to show that meetings were held on small dirt tracks in Australia and the United States before World War I. An American rider named Don Johns was known to have used broadsiding before 1914. It was said that he would ride the entire race course wide open, throwing great showers of dirt into the air at each turn.[1] By the early 1920s, Johns' style of cornering was followed in the US – where the sport was initially called "Short Track Racing" – by riders such as Albert "Shrimp" Burns, Maldwyn Jones and Eddie Brinck.[2] Consequently, two long-held and common beliefs are incorrect: first, that New Zealand-born rider Johnnie Hoskins invented the sport, and second, that the first meeting was held on 15 December 1923 at West Maitland Showground, in the Hunter Region of New South Wales, Australia. For instance, a contemporary newspaper report of this meeting, in the Maitland Mercury, mentions previous meetings.

The first meeting in the United Kingdom took place at High Beech on 19 February 1928.[3] There are, however, claims that meetings were held in 1927 at Camberley, Surrey and Droylsden, Lancashire. Despite being described as "the first British Dirt Track meeting" at the time, the meeting at Camberley on 7 May 1927 differed in that the races were held in a clockwise direction.[4] Races at Droylsden were held in an anti-clockwise direction but it is generally accepted that the sport arrived in the United Kingdom when Australians Billy Galloway and Keith McKay arrived with the intention of introducing speedway to the Northern Hemisphere. Both featured in the 1928 High Beech meeting. The first speedway meeting in the UK to feature bikes with no brakes and broadsiding round corners on loose dirt was the third meeting held at High Beech on 9 April 1928, where Colin Watson, Alf Medcalf and "Digger" Pugh demonstrated the art for the first time in the UK.
Proto speedway was staged in Glasgow at the Olympic Stadium (Glasgow Nelson) on April 9, 1928 and the first fully professional meeting was staged at Celtic Park on April 28, 1928. The first meeting in Wales was staged at Cardiff White City on Boxing Day 1928.

A speedway rider waits at the start gate for his 3 opponents

In the 1928/29 season at the Melbourne Exhibition Speedway, Australian Colin Stewart won the prestigious Silver Gauntlet, which required the rider to win the feature race 10 times in one season. He won it 12 times. He also achieved success at an international level, racing for Southampton Saints in 1929 and captained Glasgow in the Northern League in 1930 before moving to Wembley Lions in 1931, for whom he rode in just four matches, averaging 4.00 points per match. He also raced in the 1930 Scottish Championship which was won by Wembley Lions' Harry Whitfield.

The forerunner of the World Championship, the Star Riders' Championship, was inaugurated in Great Britain in 1929 but was split into two sections as it was felt that the British riders were not yet the equal of the Australians and Americans. Frank Arthur won the Overseas Section and Roger Frogley the British. The following year the two sections were amalgamated and Vic Huxley proved to be the winner.[5] Huxley was also runner-up three times and won the first British Match Race championship in 1931.

Each track is between 260 and 425 metres long and it takes approximately one minute to complete four laps. For example, 10 time Australian ChampionLeigh Adams set a record time of 59 seconds on a 342 metres (1,122 ft) track and produced an average speed of 83 km/h (49 mph). The speed on straight sections of the track reaches 110 km/h (70 mph) or more on longer tracks, but the limited speed on curves lowers the average.

At the start of a race it takes between one and two seconds for the motorcycle to reach the "curve speed" (somewhat lower than the average), which is roughly estimated to be the equivalent of 2.5 to 3 seconds to reach 100 kilometres per hour (62 mph) (or 0 to 60 mph). The start of the race is an important aspect of the race overall. "Gating" correctly can help a rider gain an initial advantage over other riders but speed advantages can be made as a race progresses. Those riders willing to take a risk and opt for finding the grippy parts of the track rather than the race line, are sometimes rewarded with extra speed allowing them to pass other riders either on the outside or the inside.

Tracks used for professional speedway racing are regulated by the Fédération Internationale de Motocyclisme (FIM) who provide rules concerning construction, size and safety requirements.[6] Speedway racing takes place on a level oval track consisting of two straights joined by two semicircles. Tracks must be between 260 and 425 metres (853 and 1394 ft) in length, this is measured at a distance of 1 metre (3.3 ft) from the inner boundary. Tracks may be banked, but the gradient must under no circumstances exceed 5% in the straight, 10% in the bends, and must remain constant and grow from the inner edge to the safety fence. A white start line is marked across the track approximately mid-way along one of the straights. The starting area is also divided into four equal parts (known as gates) by white lines marked at right angles to the start line and extending back at least 1 metre (3.3 ft). Additional rules govern the placement of warning systems such as lights and also the construction of the starting mechanism. The minimum track width is 10 metres (33 ft) on the straights and the bends must be at least 14 metres (46 ft) wide. The minimum widths give each rider adequate space to safely navigate the track. The start line and starting gate assembly is halfway along one of the two straight sections of the track. Starting gates are simple spring-loaded mechanisms that raise two or three strands of tape to start the race.[6]

The FIM regulations require licensed tracks to provide a garage or pit area for motorcycles as well as medical and press facilities. Track boundaries are marked by white lines or barriers on the inside and outside of the track, any rider who crosses this boundary with both wheels will be disqualified unless they only did so in the interest of safety or were forced to by another competitor.[6]

The track surface consists of four layers of grading. The topmost of which must be of shale, granite, brick granules or other loose material of which no individual piece can be over 7 millimetres (0.28 in) in size. Competitors use this surface to slide their machines sideways (powersliding or broadsiding) into the bends using the rear wheel to scrub-off speed while still providing the drive to power the bike forward and around the bend. The skill of speedway lies in the overall ability of the rider to control his motorcycle when cornering and thus avoid losing places through deceleration. The use of asphalt, concrete and tarmac for any layer is prohibited. The top layer must be levelled or "graded" at intervals during an event by tractors towing specially adapted rakes to evenly re-distribute the surface. Tracks are watered before and, if needed, during meetings to prevent the surface becoming too dry and to protect the public and the riders from dust.[6]

Air-fence close-up

Safety requirements include the use of suspended wire fences, air fences and wooden fences. Air fences are made up of inflated panels installed on the bends. The fence is designed to dissipate energy by allowing an impacted area to compress and transfer air into the rest of the fence through blow-off valves or restriction ports connected to the other sections.[7] They are mandatory for tracks in the British Elite League, Polish Ekstraliga, Speedway Grand Prix and Speedway World Cup. Neutral zones outside the track provide safe run-off areas for riders and their machinery to minimise the potential risk of injury to spectators.[6] The majority of tracks are dedicated to speedway or other sports such as sidecar speedway and banger racing. For larger events, the FIM occasionally sanctions the use of stadiums that install temporary tracks such as the British Grand Prix held at the Millennium Stadium in Cardiff.

Speedway uses a unique type of motorcycle, governed by the FIM's "Track Racing Technical Rules".[8] In the past, bikes with upright engines were used (the name taken from the way the engine sits in the frame), but today most professional riders use laydown bikes as it is argued that they are easier to handle. As speedway bikes do not use brakes, the clutch is used as a release mechanism at the start of races. FIM regulations state that the motorcycles must have no brakes, are fueled by pure methanol, use only one gear and weigh a minimum of 77 kilograms (170 lb). By using engine and rear wheel sprockets the gear ratio can be adjusted as required for track conditions.[8] The use of methanol allows for an increased compression ratio to the engine producing more power than other fuels and resulting in higher speeds (approximately 130 kilometres per hour (81 mph) when cornering).

In addition all motorcycles must have a safety cut out device fitted; this is defined as a switch that "must cut off the circuit of the electrical supply by the simple action of pulling a lanyard or a non-elastic string (with a maximum length of 30 centimetres (12 in)) attached to the rider's right wrist."[8] The high compression ratio of the engine can also assist in slowing down a machine; if the throttle is closed the engine may stop. Riders can stop the bike by deliberately laying down the bike on the track and this technique is used to avoid riders who fall in front of a pursuing colleague. Before cut outs were fitted an engine was stopped in an emergency situation by removing the plug lead from the spark plug or shutting off the fuel supply.

Races (known as heats) consist of four riders racing over four laps from a standing start. Riders wear different coloured helmets, traditionally in team events red and blue denote home team riders, and white and yellow/black quartered colours (latterly plain yellow) denote visiting riders. The starting area is divided into a grid of four equal parts and the riders from each team must take their place in alternate grids or "gates". The colours also denote starting positions in individual events; Red is the inside gate (gate 1), blue starts from gate 2, white starts from gate 3 and yellow/black starts on the outside (gate 4). Riders must be able to get their bikes to the start line under their own power, without any external assistance and not by pushing the machine, then line up in parallel.

A rider who is not at the start line within a reasonable period of time is also liable to be disqualified, although league matches in the UK allow teams to elect to start the disqualified rider fifteen metres back from the tapes or replace the disqualified rider with a team reserve. This period of time is standardised to two minutes from a time determined by the match referee and usually indicated by a bell, a rotating orange lamp or a digital clock readout. All riders must be at the tapes under their own power before the two minutes have elapsed. Additional time between races will be allowed by, and at the discretion of, the referee if a rider has two consecutive rides, to allow the rider time to prepare.

A starting gate consisting of two or more tapes is erected across the start line. The riders must situate themselves not more than 10 centimetres (3.9 in) from this and not touch it once the green light comes on, they must also remain stationary until the tapes are raised. Failure to do so is known as a tape infringement and can result in a false start being recorded and the rider penalised (disqualified, or in league matches in Great Britain, a 15-metre penalty or replace the disqualified rider with a team reserve). The race is started with the raising of the start tape mechanism operated by the match referee and the riders must proceed around the track in an anti-clockwise direction without both wheels illegally leaving the track boundaries.

Once a race is under way, no rider can receive outside assistance, including push-starts, from others. Historically, pushers were allowed at the start of the race. A white line at the 30 metre mark used to designate the extent to which a push was allowed but due to safety concerns, assistance is now illegal.

Occasionally races consist of six riders but this is rare as most tracks are too narrow to accommodate the extra riders safely.

Speedway operates a sliding scale for scoring (known as the 3-2-1-0 method). Three points are scored for first place, two points for second place and one point for third place. A rider does not score when finishing fourth, or failing to finish, or if excluded from a race. These points accumulate over the competition, with riders points either counting towards individual or team placings. In the event of a tie, the race is commonly awarded as a dead heat. If it is a tie for first place, they will both receive two points. A tie for second place earns each rider one point while a joint-last finish earns each rider zero points. Teams can use a tactical substitute rule once in a meeting. If that team is eight (six in World Cup) or more points in arrears, they may bring in the use of a different rider in their team lineup, to race in any heat except for heat 15. This may be different in World cup or event racing. If they are ten or more points behind, a rider with a scheduled ride may go out for double points, in which the riders points will be doubled if he beats a rider of the opposing team. Any rider taking a tactical substitute ride or double points ride is denoted by a black and white helmet colour as rather than one of the four usual coloured helmets. If that rider remains unbeaten by either opposition rider his scored points are doubled and also count towards the rider's calculated match average (CMA).

CMAs scale from 3.00 to 12.00, any rider scoring above or below this range of values will be awarded the maximum or minimum respectively. These averages are used in leagues such as the Premiership in the UK to identify heat-leaders for the purposes of choosing which riders to enter for each race.

At the start of a season, a rider retains their last recorded CMA (or assessed CMA if they have never previously established one) until they have competed in six home and six away matches. A new CMA is then issued that comes into effect seven days later. These are subsequently updated on the 15th of every month from May onwards, and come into effect on the first of the next month.

These CMA's are used in most professional leagues and are altered or weighted depending on the league the rider gained the CMA in. A rider that has no recorded average will receive an indicative CMA for the start of the season that is assessed on their prior experience in the sport.

An international individual speedway championship has taken various forms since its beginnings in the 1930s, with the official World Championship first held in 1936. The present FIM Speedway Grand Prix (SGP) championship organised by Speedway Grand Prix (IMG since 2007) has taken place since 1995. The SGP uses a scoring system based on each riders overall final position. The rider who has gained the most points at the end of the tournament is declared the World Champion. Australian rider Jason Doyle is the current (2017) World Champion. The annual British Grand Prix is currently held at the Millennium Stadium in Cardiff, Wales.

Scoring in Grand Prix events changed in 2005 with riders scoring 3-2-1-0 in their races and these points being carried forward to decide the winner of each Grand Prix. At the end of the series the highest scorer becomes the world champion.

Currently, no world team championship is contested for senior riders. The first such championship was the Speedway World Team Cup, which was contested annually from 1960 to 2000. It was replaced by the Speedway World Cup, another annual event, in 2001. Both competitions featured teams from the major speedway countries, usually in a series of meetings over the space of a week in the summer. The final World Cup Champions were Poland in 2017.

The Speedway World Pairs Championship was an annual speedway event held each year in different countries. Competing countries picked their top two riders to represent them (or in some cases, those who were available). The first competition was held in 1970 and the final competition was held in 1993. From 1994 the World Pairs was merged with the World Team Cup. Starting in 2018, a new pairs championship, the Speedway of Nations, will replace the Speedway World Cup on the sport's calendar.

Most European countries run their own domestic speedway leagues. The FIM affiliated governing bodies in each country operate league systems, normally comprising several divisions, in which the teams gain points throughout the season depending on results. Teams are placed into tables, placing them in order according to points accrued. Most commonly, each team races every other team in its league at home and away in each season, in a round-robin tournament. Meetings traditionally consist of two teams riding against each other with four riders in each race with two home team riders and two away team riders. Meetings usually feature fifteen heats and each rider is scheduled to ride four or five times. The team with the most points at the end of the meeting is the winner. Most league seasons end with play-offs - a series of meetings between the highest finishing teams to determine a league champion. The champions may be promoted to a higher division and the team finishing at the bottom are in some countries relegated to a lower division.

The majority of countries supplement the league system with one or more cup competitions. These are organised on a knock-out basis, the winner of each match proceeding to the next round and the loser taking no further part in the competition.

The major speedway nations in Europe are the United Kingdom, Sweden, Poland and Denmark. These countries run a number of leagues and have regular fixtures throughout the traditional speedway season that runs from March to October. On a smaller scale, competitions are also held in Argentina, Australia, Czech Republic, Italy, Russia, Slovenia and the United States. Some countries' top divisions feature highly paid star riders. In smaller countries and lower divisions, riders may be part-timers with a second job, or amateurs.

There are three championships in Poland: individual (IMP), pairs (MPPK) and team (the DMP consisting of three leagues). The Junior under-21 championships also has three competitions: individual (MIMP), pairs (MMPPK) and team (MDMP). There are three leagues: Extraleague, First League and Second League. In the 2007 season, the Extraleague and First League had eight teams competing and the Second League had seven teams. The GKSŻ organizes the Golden Helmet, Silver Helmet (Under-21) and Bronze Helmet (Under-19) competitions. Individual meetings such as the Criterium of Polish Speedway League Aces - Mieczysław Połukard Memorial, Alfred Smoczyk Memorial and Edward Jancarz Memorial are also popular.

Speedway in Sweden is governed by the Swedish Motorcycle and Snowmobile Federation (SVEMO). The first Swedish speedway league was founded in 1948 and copied the British format of league racing, including adopting the Swedish version of several British teams nicknames.

The Elite League (Elitserien) was established in 1982 and has ten teams. At the end of each season the top four teams ride in the play-offs in semi-finals and a final and the winner of the final are the Elitserien champions. The team finishing bottom of the league are relegated to the National league (Allsvenskan). The Allsvenskan has seven teams and before the introduction of the Elitserien in 1982 was the top flight speedway league in Sweden. As with the Allsvenskan, the top four teams at the end of each season ride in the play-offs in semi-finals and a final. The Allsvenskan Division One is the third tier of Swedish speedway with seven teams. The team finishing the season in first place are champions and can apply for promotion to the Allsvenskan, subject to having suitable facilities and sufficient finances.

Speedway in Denmark is administrated by Danmarks Motor Union (DMU). The sport was introduced into Denmark in the 1930s but it didn't boom until the 1970s. Notable Danish speedway riders today include - Nicki Pedersen, Bjarne Pedersen and Hans Nørgaard Andersen. Former rider, Ole Olsen won the World Championship three times and his success helped popularise the sport in Denmark. Since retiring Olsen has become an FIM Speedway Grand Prix race director. A popular Danish rider in the 1960s was Arne Pander, and in the 1980s Erik Gundersen, Jan O Pedersen and Hans Nielsen (who was also an active racer through the 1990s).

Speedway meetings are held between April and September.[10] The Danish League (Dansk Speedway Liga) has six teams with meetings traditionally held on Wednesday evenings. At the end of each season the top four teams compete in the play-offs in semi-finals and a final. The winner of the final are the league champions. There is no promotion or relegation and membership of the Danish League is by application only.[10] At the end of each season the top five teams in the Danish League compete in the Danish Super Cup', an end-of-season competition, held as a single event. It is hosted by the winning team from the previous season.

Both Division One and Division Two are the second and third tier and are mostly for amateur riders. Meetings are held on Saturdays with a mid-summer break. Division One can have a maximum of eight teams, with the remaining teams riding in Division Two. Meetings are staged using a four-team format. In principle, the team finishing bottom of Division One is relegated and replaced by the top team in Division Two as long as their parent club does not already have a team in Division One. However, this does not always happen for financial reasons. There is also no promotion and relegation if the bottom team in Division One and the top team in Division Two are operated by same club.[10]

The Individual Speedway Danish Championship is a competition for riders holding a Danish passport and a valid DMU licence. Riders must submit their entries at least four weeks before the first meeting of the competition. Any riders who competed in the Speedway Grand Prix or World Championship Qualifying rounds during the previous season are seeded directly to the Final. The DMU may also seed other riders directly to the Final at their discretion. Either one or two semi-finals are staged depending on the number of riders entering the competition (excluding the seeded riders who go straight through to the Final). Riders are selected for these rounds according to the previous season's Danish averages. If one semi-final is held, the highest-placed riders (plus two reserves) qualify for the Final. If two semi-finals are held, the highest-placed riders (plus one reserve) from each meeting qualify for the Final. The winner of the Final is awarded a gold medal and declared Danish Individual Champion. The riders finishing second and third are awarded silver and bronze medals respectively. The final classification also determines which riders qualify for the World Individual Speedway Championship.

The Danish Under 21 Individual Speedway Championship is a competition for riders holding a Danish passport, a valid DMU licence, and who are under 21 years of age on 1 January in the year of the competition. Riders wishing to compete must submit their entries at least four weeks before the first meeting of the competition. If there are 72 or more entries, four quarter-finals are staged. If there are between 54 and 71 entries, three quarter-finals are staged. If there are fewer than 54 entries, two semi-finals are held. Riders are selected for these rounds according to the previous season's averages in Danish matches only. When four quarter-finals are staged, the top eight riders (plus one reserve) in each progress to the semi-finals. When three quarter-finals are staged, the top ten riders (plus two reserves) from one round, and the top eleven riders (plus one reserve) from each of the other rounds, progress to the semi-finals. The top eight riders (plus one reserve) from each semi-final meet in the Final. The winner of the Final is awarded a gold medal and declared Danish Junior Individual Champion. Riders finishing second and third are awarded silver and bronze medals respectively. The top five finishers qualify for the World Junior Speedway Championship.

There is a great depth of league speedway for all ages in Denmark. The Youth Leagues are for riders between eight and eighteen years of age and 80cc bikes are used. The Micro Leagues are for riders between three and ten years of age and 50cc bikes are used. And the Old Boys League is for riders over 33 years of age.

Although there was a short lived inter-state competition in Australia during the 1970s, due to the large size of the country riders have traditionally raced mostly at their local tracks, though the top riders often race away from 'home' for championship or other high-profile meetings.

The Australian Individual Speedway Championship is the oldest continuously running national speedway championship in the world having been run since 1926 with the exception of 1942–1945 when racing was suspended during World War II, and 1955–1961 when the championship was not held. The first championship was held at the Newcastle Showgrounds in Newcastle, New South Wales and was won by American rider Cec Brown. For a number of years qualification for the Australian Final came from the various State Championships held around the country. The Australian Final was held in various Australian states, usually on a rotating basis. The top places in the Final would then progress to the next stage of the World Championship qualifying. At times the next stage varied from the short lived Australasian Final which included riders from New Zealand, the Overseas Final which saw Commonwealth riders race with the Americans, or the Commonwealth Final which was restricted to riders from Commonwealth nations. The Australian Solo Final was run in the traditional single meeting format from 1926-2002 (though in the early years of the championship there was often more than one title contested as championships were held over anywhere from 3-6 laps, often depending on the size of the track). Since 2003 the Australian Championship has been run over a series of rounds (usually 3-5 rounds).

Australia also runs annual national Championship meetings for Under-16s (since 1982) and Under-21s (since 1987). These meetings are run in the traditional single meeting format and like the senior championship was for a number of years, the Finals are held in various Australian states on a rotating basis.

Bulgaria has one domestic league, with a total of six speedway tracks. In 2011, after years of neglect, the National Championship was restored, conducted in cooperation with Romania.
In 1977 the track in Targovishte, in the country's north east, was licensed for international meetings. The track then held the quarter-final of the European youth championship in 1978, won by Nikolay Manev. The eighth-finals were held there in 1982, 1985, 1986 and 1987, with a semi-final in 1980 and the 1982 semi-final for the World pairs championship, followed by the 1988 quarter-finals for the European youth championship.

Speedway in Germany is overshadowed by its more popular track racing variant Sandbahn (Longtrack). However, the country has occasionally hosted the Speedway Grand Prix of Germany and has produced one Speedway World Champion, Egon Müller in 1983. Another German rider is Martin Smolinski, who won the New Zealand Grand Prix in Auckland in March 2014.

1.
Olympic Games
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The Olympic Games are considered the worlds foremost sports competition with more than 200 nations participating. The Olympic Games are held four years, with the Summer and Winter Games alternating by occurring every four years. Their creation was inspired by the ancient Olympic Games, which were held in Olympia, Greece, Baron Pierre de Coubertin founded the International Olympic Committee in 1894, leading to the first modern Games in Athens in 1896. The IOC is the body of the Olympic Movement, with the Olympic Charter defining its structure. The evolution of the Olympic Movement during the 20th and 21st centuries has resulted in changes to the Olympic Games. The IOC has had to adapt to a variety of economic, political, as a result, the Olympics has shifted away from pure amateurism, as envisioned by Coubertin, to allowing participation of professional athletes. The growing importance of mass media created the issue of corporate sponsorship, World wars led to the cancellation of the 1916,1940, and 1944 Games. Large boycotts during the Cold War limited participation in the 1980 and 1984 Games, the Olympic Movement consists of international sports federations, National Olympic Committees, and organising committees for each specific Olympic Games. As the decision-making body, the IOC is responsible for choosing the host city for each Games, the IOC also determines the Olympic programme, consisting of the sports to be contested at the Games. There are several Olympic rituals and symbols, such as the Olympic flag and torch, over 13,000 athletes compete at the Summer and Winter Olympic Games in 33 different sports and nearly 400 events. The first, second, and third-place finishers in each event receive Olympic medals, gold, silver, the Games have grown so much that nearly every nation is now represented. This growth has created numerous challenges and controversies, including boycotts, doping, bribery, every two years the Olympics and its media exposure provide unknown athletes with the chance to attain national and sometimes international fame. The Games also constitute an opportunity for the host city and country to themselves to the world. The Ancient Olympic Games were religious and athletic festivals held every four years at the sanctuary of Zeus in Olympia, competition was among representatives of several city-states and kingdoms of Ancient Greece. These Games featured mainly athletic but also combat such as wrestling. It has been written that during the Games, all conflicts among the participating city-states were postponed until the Games were finished. This cessation of hostilities was known as the Olympic peace or truce and this idea is a modern myth because the Greeks never suspended their wars. The truce did allow those religious pilgrims who were travelling to Olympia to pass through warring territories unmolested because they were protected by Zeus

2.
2017 World Games
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Wrocław was awarded the right on January 12,2012, defeating Budapest, Hungary to host the Games. Wrocław was the city in Europe after London, Karlsruhe, The Hague, Lahti. Four cities had expressed interest in hosting the 2017 Games, after examination of the files, the application of Genoa, Italy was not brought to the next step. The candidate cities have been announced by the IWGA in August 2011 and they are Budapest, Hungary Cape Town, South Africa Wrocław, Poland Just few days before the awarding ceremony Cape Town withdrew its bid for financial reasons. The final decision was announced by Ron Froehlich, President of the International World Games Association on 12 January 2012 in Lausanne, the 10th edition of The World Games was awarded to Wrocław. Numbers in parentheses indicate the number of events contested in each sport

3.
Motorcycle
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A motorcycle is a two- or three-wheeled motor vehicle. Motorcycle design varies greatly to suit a range of different purposes, long travel, commuting, cruising, sport including racing. Motorcycling is riding a motorcycle and related social activity such as joining a motorcycle club, in 1894, Hildebrand & Wolfmüller became the first series production motorcycle, and the first to be called a motorcycle. In 2014, the three top motorcycle producers globally by volume were Honda, Yamaha, and Hero MotoCorp, in developing countries, motorcycles are overwhelmingly utilitarian due to lower prices and greater fuel economy. Of all the motorcycles in the world, 58% are in the Asia-Pacific and Southern and Eastern Asia regions, according to the United States Department of Transportation the number of fatalities per vehicle mile traveled was 37 times higher for motorcycles than for cars. The term motorcycle has different legal definitions depending on jurisdiction, there are three major types of motorcycle, street, off-road, and dual purpose. Within these types, there are many sub-types of motorcycles for different purposes, there is often a racing counterpart to each type, such as road racing and street bikes, or motocross and dirt bikes. Street bikes include cruisers, sportbikes, scooters and mopeds, off-road motorcycles include many types designed for dirt-oriented racing classes such as motocross and are not street legal in most areas. Dual purpose machines like the style are made to go off-road but include features to make them legal. Each configuration offers either specialised advantage or broad capability, and each design creates a different riding posture, the first internal combustion, petroleum fueled motorcycle was the Daimler Reitwagen. It was designed and built by the German inventors Gottlieb Daimler and Wilhelm Maybach in Bad Cannstatt, instead, it relied on two outrigger wheels to remain upright while turning. The inventors called their invention the Reitwagen and it was designed as an expedient testbed for their new engine, rather than a true prototype vehicle. The first commercial design for a cycle was a three-wheel design called the Butler Petrol Cycle. He exhibited his plans for the vehicle at the Stanley Cycle Show in London in 1884, the vehicle was built by the Merryweather Fire Engine company in Greenwich, in 1888. The engine was liquid-cooled, with a radiator over the driving wheel. Speed was controlled by means of a valve lever. No braking system was fitted, the vehicle was stopped by raising and lowering the rear driving wheel using a foot-operated lever, the driver was seated between the front wheels. It wasnt, however, a success, as Butler failed to find sufficient financial backing, many authorities have excluded steam powered, electric motorcycles or diesel-powered two-wheelers from the definition of a motorcycle, and credit the Daimler Reitwagen as the worlds first motorcycle

4.
Gear
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A gear or cogwheel is a rotating machine part having cut teeth, or cogs, which mesh with another toothed part to transmit torque. Geared devices can change the speed, torque, and direction of a power source, Gears almost always produce a change in torque, creating a mechanical advantage, through their gear ratio, and thus may be considered a simple machine. The teeth on the two meshing gears all have the same shape, two or more meshing gears, working in a sequence, are called a gear train or a transmission. A gear can mesh with a linear toothed part, called a rack, the gears in a transmission are analogous to the wheels in a crossed, belt pulley system. An advantage of gears is that the teeth of a gear prevent slippage, in transmissions with multiple gear ratios—such as bicycles, motorcycles, and cars—the term gear as in first gear refers to a gear ratio rather than an actual physical gear. The term describes similar devices, even when the ratio is continuous rather than discrete, or when the device does not actually contain gears. Early examples of gears date from the 4th century BC in China, examples of further development include, Ma Jun used gears as part of a south-pointing chariot. The Antikythera mechanism is an example of an early and intricate geared device. Its time of construction is now estimated between 150 and 100 BC, the water-powered grain-mill, the water-powered saw mill, fulling mill, and other applications of watermill often used gears. The first mechanical clocks were built in AD725, the 1386 Salisbury cathedral clock may be the worlds oldest working mechanical clock. The definite ratio that teeth give gears provides an advantage over other drives in precision machines such as watches that depend upon an exact velocity ratio, an external gear is one with the teeth formed on the outer surface of a cylinder or cone. Conversely, a gear is one with the teeth formed on the inner surface of a cylinder or cone. For bevel gears, a gear is one with the pitch angle exceeding 90 degrees. Internal gears do not cause output shaft direction reversal, spur gears or straight-cut gears are the simplest type of gear. They consist of a cylinder or disk with teeth projecting radially, though the teeth are not straight-sided, the edge of each tooth is straight and aligned parallel to the axis of rotation. These gears mesh together correctly only if fitted to parallel shafts, No axial thrust is created by the tooth loads. Spur gears are excellent at moderate speeds but tend to be noisy at high speeds, helical or dry fixed gears offer a refinement over spur gears. The leading edges of the teeth are not parallel to the axis of rotation, since the gear is curved, this angling makes the tooth shape a segment of a helix

5.
Brake
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A brake is a mechanical device that inhibits motion by absorbing energy from a moving system. It is used for slowing or stopping a vehicle, wheel, axle, or to prevent its motion. Most brakes commonly use friction between two surfaces pressed together to convert the energy of the moving object into heat, though other methods of energy conversion may be employed. For example, regenerative braking converts much of the energy to electrical energy, other methods convert kinetic energy into potential energy in such stored forms as pressurized air or pressurized oil. Eddy current brakes use magnetic fields to convert energy into electric current in the brake disc, fin, or rail. Still other braking methods even transform kinetic energy into different forms, Brakes are generally applied to rotating axles or wheels, but may also take other forms such as the surface of a moving fluid. In practice, fast vehicles usually have significant air drag, almost all wheeled vehicles have a brake of some sort. Even baggage carts and shopping carts may have them for use on a moving ramp, most fixed-wing aircraft are fitted with wheel brakes on the undercarriage. Some aircraft also feature air brakes designed to reduce their speed in flight, notable examples include gliders and some World War II-era aircraft, primarily some fighter aircraft and many dive bombers of the era. These allow the aircraft to maintain a speed in a steep descent. The Saab B17 dive bomber and Vought F4U Corsair fighter used the deployed undercarriage as an air brake, Friction brakes on automobiles store braking heat in the drum brake or disc brake while braking then conduct it to the air gradually. When traveling downhill some vehicles can use their engines to brake, when the brake pedal of a modern vehicle with hydraulic brakes is pushed against the master cylinder, ultimately a piston pushes the brake pad against the brake disc which slows the wheel down. On the brake drum it is similar as the cylinder pushes the brake shoes against the drum which also slows the wheel down, Brakes may be broadly described as using friction, pumping, or electromagnetics. Typically the term brake is used to mean pad/shoe brakes and excludes hydrodynamic brakes. Friction brakes are often rotating devices with a pad and a rotating wear surface. Other brake configurations are used, but less often, a drum brake is a vehicle brake in which the friction is caused by a set of brake shoes that press against the inner surface of a rotating drum. The drum is connected to the rotating roadwheel hub, drum brakes generally can be found on older car and truck models. However, because of their low production cost, drum brake setups are also installed on the rear of some low-cost newer vehicles, compared to modern disc brakes, drum brakes wear out faster due to their tendency to overheat

6.
Soil
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Soil is a mixture of minerals, organic matter, gases, liquids, and countless organisms that together support life on Earth. Soil is called the Skin of the Earth and interfaces with the lithosphere, the hydrosphere, the atmosphere, the term pedolith, used commonly to refer to the soil, literally translates ground stone. Soil consists of a phase of minerals and organic matter, as well as a porous phase that holds gases. Accordingly, soils are often treated as a system of solids, liquids. Soil is a product of the influence of climate, relief, organisms, Soil continually undergoes development by way of numerous physical, chemical and biological processes, which include weathering with associated erosion. Given its complexity and strong internal connectedness soil has been considered as an ecosystem by soil ecologists. Most soils have a dry bulk density between 1.1 and 1.6 g/cm3, while the particle density is much higher. Little of the soil of planet Earth is older than the Pleistocene and none is older than the Cenozoic, Soil science has two basic branches of study, edaphology and pedology. Edaphology is concerned with the influence of soils on living things, pedology is focused on the formation, description, and classification of soils in their natural environment. In engineering terms, soil is referred to as regolith, or loose material that lies above the solid geology. Soil is commonly referred to as earth or dirt, technically, as soil resources serve as a basis for food security, the international community advocates its sustainable and responsible use through different types of soil governance. Soil is a component of the Earths ecosystem. The worlds ecosystems are impacted in far-reaching ways by the carried out in the soil, from ozone depletion and global warming, to rainforest destruction. Following the atmosphere, the soil is the next largest carbon reservoir on Earth, as the planet warms, soils will add carbon dioxide to the atmosphere due to its increased biological activity at higher temperatures. Thus, soil carbon losses likely have a positive feedback response to global warming. Since soil has a range of available niches and habitats. A gram of soil can contain billions of organisms, belonging to thousands of species, mostly microbial, Soil has a mean prokaryotic density of roughly 108 organisms per gram, whereas the ocean has no more than 107 procaryotic organisms per milliliter of seawater. Since plant roots need oxygen, ventilation is an important characteristic of soil and this ventilation can be accomplished via networks of interconnected soil pores, which also absorb and hold rainwater making it readily available for plant uptake

7.
Shale
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Shale is a fine-grained, clastic sedimentary rock composed of mud that is a mix of flakes of clay minerals and tiny fragments of other minerals, especially quartz and calcite. The ratio of clay to other minerals is variable, shale is characterized by breaks along thin laminae or parallel layering or bedding less than one centimeter in thickness, called fissility. Mudstones, on the hand, are similar in composition. Before the mid 19th century, the slate, shale. In the context of underground mining, shale was frequently referred to as slate well into the 20th century. Non-fissile rocks of similar composition but made of smaller than 0.06 mm are described as mudstones or claystone. Rocks with similar sizes but with less clay and therefore grittier are siltstones. Shale is the most common sedimentary rock, shales are typically composed of variable amounts of clay minerals and quartz grains and the typical color is gray. Addition of variable amounts of minor constituents alters the color of the rock, black shale results from the presence of greater than one percent carbonaceous material and indicates a reducing environment. Black shale can also be referred to as black metal, red, brown and green colors are indicative of ferric oxide, iron hydroxide, or micaceous minerals. Clays are the constituent of shales and other mudrocks. The clay minerals represented are largely kaolinite, montmorillonite and illite, clay minerals of Late Tertiary mudstones are expandable smectites whereas in older rocks especially in mid- to early Paleozoic shales illites predominate. The transformation of smectite to illite produces silica, sodium, calcium, magnesium, iron and these released elements form authigenic quartz, chert, calcite, dolomite, ankerite, hematite and albite, all trace to minor minerals found in shales and other mudrocks. Shales and mudrocks contain roughly 95 percent of the matter in all sedimentary rocks. However, this amounts to less than one percent by mass in an average shale, black shales, which form in anoxic conditions, contain reduced free carbon along with ferrous iron and sulfur. Pyrite and amorphous iron sulfide along with carbon produce the black coloration, the process in the rock cycle which forms shale is called compaction. The fine particles that compose shale can remain suspended in long after the larger particles of sand have deposited. Shales are typically deposited in very slow moving water and are found in lakes and lagoonal deposits, in river deltas, on floodplains

8.
Driving
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Driving is the controlled operation and movement of a motorized vehicle with wheels, such as a car, motorcycle, truck, or bus by either a human or computer controller. The origin of the driver, as recorded from the 15th century, refers to the occupation of driving working animals. The verb to drive in origin means to force to move and it is first recorded of electric railway drivers in 1889 and of a motor-car driver in 1896. Early alternatives were motorneer, motor-man, motor-driver or motorist, french favors conducteur, while German influenced areas adopted Fahrer, and the verbs führen, lenken, steuern —all with a meaning steer, guide, navigate— translating to conduire. Her official reason was that she wanted to visit her mother, but unofficially she intended to generate publicity for her husbands invention, the automobile took off greatly afterwards and the Benzs family business eventually evolved into the present day Mercedes-Benz company. The 7. 6-mile journey took two hours, the descent was accomplished by putting the engine in low gear and doing lots of braking. In certain countries, especially the Scandinavian countries, driving and its equivalent word in the language has become a colloquialism for action in a general sense. For instance, the phrase Lets drive means roughly the same thing as the more common Lets go, Driving in traffic is more than just knowing how to operate the mechanisms which control the vehicle, it requires knowing how to apply the rules of the road. An effective driver also has an understanding of the basics of vehicle handling. Although direct operation of a bicycle and an animal are commonly referred to as riding. Driving over a distance is referred to as a road trip. A driver must have physical skills to be able to control direction, acceleration, another survey indicated that music could adversely affect a drivers concentration. Seizure disorders and Alzheimers disease are among the leading causes of mental impairment among drivers in the United States. Whether or not physicians should be allowed, or even required, to such conditions to state authorities. Driveability of a means the smooth delivery of power, as demanded by the driver. Typical causes of driveability degradation are rough idling, misfiring, surging, hesitation, a driver is subject to the laws of the jurisdiction in which he or she is driving. Most countries also have differing laws against driving while under the influence of alcohol or other drugs, aggressive driving and road rage have become problems for drivers in some areas. Some countries require a vision screening test for individuals to acquire or renew a drivers license, a 2010 systematic review found insufficient evidence to assess the effects of vision screening tests on subsequent motor vehicle crash reduction

9.
World War I
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World War I, also known as the First World War, the Great War, or the War to End All Wars, was a global war originating in Europe that lasted from 28 July 1914 to 11 November 1918. More than 70 million military personnel, including 60 million Europeans, were mobilised in one of the largest wars in history and it was one of the deadliest conflicts in history, and paved the way for major political changes, including revolutions in many of the nations involved. The war drew in all the worlds great powers, assembled in two opposing alliances, the Allies versus the Central Powers of Germany and Austria-Hungary. These alliances were reorganised and expanded as more nations entered the war, Italy, Japan, the trigger for the war was the assassination of Archduke Franz Ferdinand of Austria, heir to the throne of Austria-Hungary, by Yugoslav nationalist Gavrilo Princip in Sarajevo on 28 June 1914. This set off a crisis when Austria-Hungary delivered an ultimatum to the Kingdom of Serbia. Within weeks, the powers were at war and the conflict soon spread around the world. On 25 July Russia began mobilisation and on 28 July, the Austro-Hungarians declared war on Serbia, Germany presented an ultimatum to Russia to demobilise, and when this was refused, declared war on Russia on 1 August. Germany then invaded neutral Belgium and Luxembourg before moving towards France, after the German march on Paris was halted, what became known as the Western Front settled into a battle of attrition, with a trench line that changed little until 1917. On the Eastern Front, the Russian army was successful against the Austro-Hungarians, in November 1914, the Ottoman Empire joined the Central Powers, opening fronts in the Caucasus, Mesopotamia and the Sinai. In 1915, Italy joined the Allies and Bulgaria joined the Central Powers, Romania joined the Allies in 1916, after a stunning German offensive along the Western Front in the spring of 1918, the Allies rallied and drove back the Germans in a series of successful offensives. By the end of the war or soon after, the German Empire, Russian Empire, Austro-Hungarian Empire, national borders were redrawn, with several independent nations restored or created, and Germanys colonies were parceled out among the victors. During the Paris Peace Conference of 1919, the Big Four imposed their terms in a series of treaties, the League of Nations was formed with the aim of preventing any repetition of such a conflict. This effort failed, and economic depression, renewed nationalism, weakened successor states, and feelings of humiliation eventually contributed to World War II. From the time of its start until the approach of World War II, at the time, it was also sometimes called the war to end war or the war to end all wars due to its then-unparalleled scale and devastation. In Canada, Macleans magazine in October 1914 wrote, Some wars name themselves, during the interwar period, the war was most often called the World War and the Great War in English-speaking countries. Will become the first world war in the sense of the word. These began in 1815, with the Holy Alliance between Prussia, Russia, and Austria, when Germany was united in 1871, Prussia became part of the new German nation. Soon after, in October 1873, German Chancellor Otto von Bismarck negotiated the League of the Three Emperors between the monarchs of Austria-Hungary, Russia and Germany

10.
Central Europe
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Central Europe lies between Eastern Europe and Western Europe. The concept of Central Europe is based on a historical, social and cultural identity. Central Europe is going through a phase of strategic awakening, with such as the CEI, Centrope. While the regions economy shows high disparities with regard to income, elements of unity for Western and Central Europe were Roman Catholicism and Latin. According to Hungarian historian Jenő Szűcs, foundations of Central European history at the first millennium were in connection with Western European development. The keyword of Western social development after millennium was the spread of liberties and autonomies in Western Europe and these phenomena appeared in the middle of the 13th century in Central European countries. There were self-governments of towns, counties and parliaments, in 1335 under the rule of the King Charles I of Hungary, the castle of Visegrád, the seat of the Hungarian monarchs was the scene of the royal summit of the Kings of Poland, Bohemia and Hungary. They agreed to cooperate closely in the field of politics and commerce, in the Middle Ages, countries in Central Europe adopted Magdeburg rights. Before 1870, the industrialization that had developed in Western and Central Europe, even in Eastern Europe, industrialization lagged far behind. Russia, for example, remained rural and agricultural. The concept of Central Europe was already known at the beginning of the 19th century, an example of that-time vision of Central Europe may be seen in J. Partsch’s book of 1903. On 21 January 1904, Mitteleuropäischer Wirtschaftsverein was established in Berlin with economic integration of Germany, another time, the term Central Europe became connected to the German plans of political, economic and cultural domination. The bible of the concept was Friedrich Naumann’s book Mitteleuropa in which he called for a federation to be established after the war. The concept failed after the German defeat in World War I, the revival of the idea may be observed during the Hitler era. According to Emmanuel de Martonne, in 1927 the Central European countries included, Austria, Czechoslovakia, Germany, Hungary, Poland, Romania, italy and Yugoslavia are not considered by the author to be Central European because they are located mostly outside Central Europe. The author use both Human and Physical Geographical features to define Central Europe, the interwar period brought new geopolitical system and economic and political problems, and the concept of Central Europe took a different character. The centre of interest was moved to its eastern part – the countries that have appeared on the map of Europe, Czechoslovakia, Hungary, however, the conflict of interests was too big and neither Little Entente nor Intermarium ideas succeeded. The interwar period brought new elements to the concept of Central Europe, after the war, the Eastern part of Central Europe was placed at the centre of the concept

Wales ((listen); Welsh: Cymru [ˈkəmri] (listen)) is a country that is part of the United Kingdom and the island of …

Britain in AD 500: The areas shaded pink on the map were inhabited by the CelticBritons, here labelled Welsh. The pale blue areas in the east were controlled by Germanic tribes, whilst the pale green areas to the north were inhabited by the Gaels and Picts.